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What Does the Research Say?
The Subscapularis Repair: Why Protecting It Matters Most
The subscapularis is detached during every anatomic shoulder replacement and meticulously repaired. When that repair fails, everything else follows.
3-5%
of patients experience subscapularis failure after anatomic shoulder replacement. It's the most common and functionally significant complication, causing anterior pain, instability, and loss of internal rotation.
⚠️
Why This One Repair Matters So Much
The subscapularis is the primary internal rotator and anterior stabilizer of the shoulder. During anatomic arthroplasty, it must be detached for surgical access, then carefully reattached. If the repair fails, patients lose the ability to tuck in shirts, fasten clothing behind their back, and reach for hygiene. They may also develop anterior subluxation of the prosthesis, potentially requiring revision surgery.
Sling Duration
4-6 wk
Continuous wear, neutral rotation
Protecting the repair while preventing adhesive capsulitis
Phase 1 External Rotation Limit
30°
Maximum passive external rotation
Greater motion risks excessive tension on the healing subscapularis
Phase 1 Elevation Limit
120°
Maximum passive elevation
Per ASSET consensus guidelines, in the scapular plane
Active Motion Begins
≥6 wk
After surgeon clearance
Only after radiographic confirmation and pain below 3/10
3 Takeaways for Your Practice
1
Assessment Priority
Know the Provocative Tests for Subscapularis Failure
The belly-press test, bear-hug test, and lift-off test specifically assess subscapularis function. A positive result after arthroplasty, where the patient can't maintain pressure against the abdomen without compensating, signals possible repair failure. Test cautiously and only after Phase 1.
2
Protocol Adherence
No Active Elevation During Phase 1
Active shoulder elevation is strictly contraindicated for the first 4 to 6 weeks. Pendulum exercises should be performed with caution, as they can generate significant deltoid and rotator cuff activity that stresses healing tissues. Passive motion only, within the prescribed limits.
3
Surgical Communication
Report Internal Rotation Changes Immediately
If your patient develops new anterior pain, difficulty with internal rotation tasks, or a positive provocative test, contact the surgeon immediately. Early recognition of subscapularis failure allows for repair before chronic changes make salvage more difficult.
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This content is for informational purposes for licensed clinicians and does not constitute medical advice or a substitute for your own clinical research and judgment. Content may include AI-synthesized information; all clinical data, protocols, and dosages must be verified against official primary sources prior to patient care. Any reference to CE rules or regulations is provided as a guide and must be independently verified against current governing body requirements prior to completing credits. This article may contain links to external websites or third-party AI platforms. Ridley Learning has no control over the nature, content, and availability of those sites and does not necessarily endorse the views expressed within them. Ridley Learning is not liable for any injury, loss, clinical outcomes, or licensure issues resulting from the use of or reliance on this information. Your use of this site constitutes acceptance of these terms.
Meet the Author: Anne Osborn, PT, MPT
Anne Perry Osborn is a distinguished physical therapist and entrepreneur with over two decades of experience bridging clinical practice and healthcare education. She holds a Master of Physical Therapy from Texas Tech University Health Sciences Center and currently serves as the Owner and Director of Quality and Accreditation at Ridley Learning. With a background that includes clinical roles in outpatient rehabilitation and home health, Anne brings practical, hands-on insight to her leadership in continuing education, ensuring that learning opportunities remain relevant and impactful for today's practitioners.
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